1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
#ifndef MCA_BTL_SM_FIFO_H
#define MCA_BTL_SM_FIFO_H
#include "btl_sm.h"
#include "btl_sm_endpoint.h"
static void
add_pending(struct mca_btl_base_endpoint_t *ep, void *data, bool resend)
{
int rc;
btl_sm_pending_send_item_t *si;
opal_free_list_item_t *i;
OPAL_FREE_LIST_GET(&mca_btl_sm_component.pending_send_fl, i, rc);
/* don't handle error for now */
assert(i != NULL && rc == OMPI_SUCCESS);
si = (btl_sm_pending_send_item_t*)i;
si->data = data;
OPAL_THREAD_ADD32(&mca_btl_sm_component.num_pending_sends, +1);
/* if data was on pending send list then prepend it to the list to
* minimize reordering */
OPAL_THREAD_LOCK(&ep->endpoint_lock);
if (resend)
opal_list_prepend(&ep->pending_sends, (opal_list_item_t*)si);
else
opal_list_append(&ep->pending_sends, (opal_list_item_t*)si);
OPAL_THREAD_UNLOCK(&ep->endpoint_lock);
}
/*
* FIFO_MAP(x) defines which FIFO on the receiver should be used
* by sender rank x. The map is some many-to-one hash.
*
* FIFO_MAP_NUM(n) defines how many FIFOs the receiver has for
* n senders.
*
* That is,
*
* for all 0 <= x < n:
*
* 0 <= FIFO_MAP(x) < FIFO_MAP_NUM(n)
*
* For example, using some power-of-two nfifos, we could have
*
* FIFO_MAP(x) = x & (nfifos-1)
* FIFO_MAP_NUM(n) = min(nfifos,n)
*
* Interesting limits include:
*
* nfifos very large: In this case, each sender has its
* own dedicated FIFO on each receiver and the receiver
* has one FIFO per sender.
*
* nfifos == 1: In this case, all senders use the same
* FIFO and each receiver has just one FIFO for all senders.
*/
#define FIFO_MAP(x) ((x) & (mca_btl_sm_component.nfifos - 1))
#define FIFO_MAP_NUM(n) ( (mca_btl_sm_component.nfifos) < (n) ? (mca_btl_sm_component.nfifos) : (n) )
#define MCA_BTL_SM_FIFO_WRITE(endpoint_peer, my_smp_rank, \
peer_smp_rank, hdr, resend, retry_pending_sends, rc) \
do { \
sm_fifo_t* fifo = &(mca_btl_sm_component.fifo[peer_smp_rank][FIFO_MAP(my_smp_rank)]); \
\
if ( retry_pending_sends ) { \
if ( 0 < opal_list_get_size(&endpoint_peer->pending_sends) ) { \
btl_sm_process_pending_sends(endpoint_peer); \
} \
} \
\
opal_atomic_lock(&(fifo->head_lock)); \
/* post fragment */ \
if(sm_fifo_write(hdr, fifo) != OMPI_SUCCESS) { \
add_pending(endpoint_peer, hdr, resend); \
rc = OMPI_ERR_RESOURCE_BUSY; \
} else { \
MCA_BTL_SM_SIGNAL_PEER(endpoint_peer); \
rc = OMPI_SUCCESS; \
} \
opal_atomic_unlock(&(fifo->head_lock)); \
} while(0)
#endif
|
